Alix de Roucy was born circa 1010 to Ebles I de Roucy (c985-1033) and Beatrice de Hainaut (c995-c1030) and died circa 1068 of unspecified causes. She married Hilduin IV de Montdidier (c998-c1063) 1031 JL .
Children
| Name | Birth | Death | Joined with |
| Adélaïde de Montdidier (c1035-c1068) | 1035 | 1068 | Arnoul I de Chiny (?-1106) |
| Ebles II de Roucy (c1037-1103) | 1037 | May 1103 | Sibylle de Hauteville |
| André de Ramerupt (c1040-aft1118) | 1040 | 1118 | Adèle de Roye (bef1066-) Guisemode |
| Aélis de Montdidier (c1042-c1099) | 1042 | 1099 | Conon de Grandson (?-bef1114) |
| Marguerite de Roucy (c1045-aft1103) | 1045 | 1103 | Hugues I de Clermont (c1030-1102) |
| Ada de Montdidier (c1050-aft1121) | 1050 | 1121 | Geoffroy de Guise (?-?) Gauthier de Ath (?-?) Thierry d'Avesnes (?-?) |
| Ermentrude de Montdidier (c1053-aft1102) | 1053 | 1102 | Thibaut de Reynel (?-c1101) |
| Béatrix de Montdidier (c1055-aft1129) | Geoffroy II du Perche (c1045-1100) | ||
| Félicie de Montdidier (?-1123) | 1123 | Sancho I of Aragon (c1042-1094) | |